<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    示例
    <div id="test">
      test
      <div>1</div>
      <div id="shit">2</div>
      <div id="fk">3</div>
    </div>
    <script src="dom.js"></script>
    <script src="main.js"></script>
  </body>
</html>
